High molecular weight polyacrylates for aluminum protection in warewash applications

摘要

A warewashing detergent composition is provided for use for in cleaning of alkaline sensitive metals such as aluminum or aluminum containing alloys. The compositions include alternatives to sodium tripolyphosphate and/or other phosphorous containing raw materials, while retaining cleaning performance and corrosion prevention. According to the invention, high molecular weight polyacrylates (polyacrylic acid homopolymers) with a molecular weight of at least about 5000 are used as corrosion inhibitors and can be included for aluminum protection in a number of different detergent compositions.

主权项

1. A detergent composition comprising:
(a) an alkaline source in an amount effective to provide a use composition having a pH of at least about 8 and obtained by diluting the detergent composition with water; (b) a corrosion inhibitor component in an amount sufficient for reducing corrosion of aluminum or aluminum containing alloys, the corrosion inhibitor component comprising one or more polyacrylic acid homopolymers having a molecular weight of at least about 5,000 daltons, wherein said sufficient amount of corrosion inhibitor is between 10 wt. % and 30 wt. %; (c) a fragrance and/or dye, wherein said fragrance is in an amount between about 0.01 wt. % to about 5 wt. % and wherein said dye is in an amount between about 0.001 wt. % to about 0.5 wt. %; and (d) less than about 0.1 % by weight of phosphorous, wherein said composition does not contain polymaleic acid polymers, and wherein said composition does not include 1-hydroxy ethylidene 1-1-diphosphonic acid.